There's ways to compliment your wife without comparing or dissing others. He could have just said "I'm proud of my wife & all she's accomplished." He didn't need to say she will be bigger than Carrie, the biggest success from their season, etc.
Everyone involved in this was wrong at some point. Cade could have praised his wife without comparing others. Also, he could have apologized after it started to gain some negative attention. Maddie was too quick to jump to post her thoughts. Same with the others that chimed in. They didn't need to post all this on social media.
Gabby's dad also needs to stop talking & not get as involved in everything with his daughter. This isn't that big of a deal because it's just between Idol contestants. But he can't keep saying negative things about people especially if she continues to be successful. This isn't the first time either. What happens if he disses other country artists, industry people, etc.? It doesn't seem like he'll stop either unless someone tells him to. Gabby isn't really saying anything, but I think she does at some point have to stop her father from posting all this stuff before a bigger issue or story happens in the future.